Compressive mechanical behavior of closed cell Aluminum foam under dynamic loading

被引：0
|
作者：
Guo Y.-Z. [1 ]
Yang H. [1 ]
Liu X.-C. [1 ]
Zheng Z.-J. [2 ]
Wang J.-Z. [1 ]
机构：
[1] Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics, China Aircraft Strength Research Institute, Xi'an
[2] CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2020年 / 33卷 / 02期
关键词：
Closed-celled Aluminum foam; Inertia effect; Loading speed; Matrix properties; Stress enhancement; Voronoi model;
D O I：
10.16385/j.cnki.issn.1004-4523.2020.02.014
中图分类号：
学科分类号：
摘要：
In order to study the dynamic compression mechanical response process of the closed-cell Aluminum foam, the Voronoi model is constructed based on the pore shape and distribution of actual Aluminum foam samples. The accuracy of the model is verified based on the experimental results. Based on LS-DYNA, the differences between the Kelvin model and the Voronoi model commonly used in Aluminum foam are analyzed. The influences of loading speed, matrix properties and inertia effect on the deformation mode and stress of the closed-cell foam Aluminum are studied. The results show that the stress strain curve and deformation mode of the Voronoi model are well fitted to the experimental results, and the internal structure is more realistic than the Kelvin model of the unit cell array. The inertial effect of Aluminum foam can be neglected under low-speed compression. Due to the influence of compression inertia effect, the model exhibits obvious platform stress enhancement phenomenon with increasing speed under high speed compression. By considering the strain rate effect of the Aluminum foam matrix, the foam Aluminum platform stress is effectively improved, and the Aluminum foam also exhibits a strain rate effect. © 2020, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.
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页码：338 / 346
页数：8
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